CN109145474A - A kind of infrared imaging device recon effect analogy method suitable for emulation of fighting - Google Patents
A kind of infrared imaging device recon effect analogy method suitable for emulation of fighting Download PDFInfo
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Abstract
The present invention relates to modeling and simulating fields, propose a kind of infrared imaging device recon effect analogy method suitable for emulation of fighting.The following steps are included: being target search procedure simulation first, it is intended to judge whether the observation visual field of infrared imaging device effectively covers detected target；Followed by the detection identification process of suspicious object is simulated, it is intended to which target identification effect is judged according to mathematical model constructed by the factors such as main war skill performance, battlefield surroundings condition and the target signature information of infrared imaging device；It is finally the simulation of target position fixing process, it is intended to calculate and generate the target position information containing error is scouted.The present invention is that entire process of scouting is divided into multiple stages such as search, detection identification and confirmation positioning, and each stage model calculating depends on equipment war skill performance indicator, can preferably embody equipment build-in attribute and seem complicated；And show that this method simulation error is smaller with the contrast verification of test data, it has a good application prospect in emulation of fighting.
Description
Technical field
The invention belongs to emulate warfare equipment technical field, and in particular to a kind of to set suitable for the infrared imaging emulated of fighting
Standby recon effect analogy method.
Background technique
The case where emulation of fighting is according to known or hypothesis, the skill of sunykatuib analysis is carried out to operational environment and Campaign Process
Art, method and activity.With the quick raising of computer technology, emulation of fighting, which has become, examines operation plan, evaluation weapon
Equipment Efficacy and the effective means for studying new theories for military operations.To fight emulation for, weaponry operation simulation and
Effect simulation is undoubtedly mostly important link.Technical performance, battlefield ring due to weaponry scouting efficiency by reconnaissance equipment
The influence of many factors such as the sensory function of border condition, target relevant information and scout, recon effect simulation often seem
It is extremely difficult.Recently as a large amount of utilizations of the infrared imaging reconnaissance equipment in battlefield, how infrared imaging device is simulated
Recon effect has become Simulation of Military Equipment Battling critical issue urgently to be resolved.It is imitated although having scouted a little about infrared imaging at present
The technique study of fruit modeling, but on the whole, some modellings are too complicated, need many device level performance parameter or experiment
Data, and it is computationally intensive, not adapting to fight emulates the needs of especially major engagement emulation；And some modellings is too simple
Single, the capability of reconnaissance system can not find full expression in simulations, and recon effect simulation is not accurate enough, and then will affect
The confidence level of combat simulation result.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of infrared imaging device recon effect mould suitable for emulation of fighting
Quasi- method, the method are simulated by target search procedure, judge whether the observation visual field of infrared imaging device effectively covers quilt
Detect target；Secondly the detection identification process of suspicious object is simulated, target identification effect is judged, finally to target position fixing process
Simulation calculates and generates the target position information containing error is scouted；
Further, it the described method comprises the following steps:
S1: search process simulation judges whether the observation visual field of outer imaging device effectively covers detected target；
S2: detection identification process simulation, according to main war skill performance, battlefield surroundings condition and the target of infrared imaging device
Mathematical model constructed by the factors such as characteristic information judges whether the target for finding to be searched completely；
S3: the simulation of target position fixing process is generated containing the targeting information for scouting error；
Further, effectively covering meets the following conditions in the S1 search process simulation:
1): target is located within the scope of infrared imaging device maximum effect；
2): infrared imaging device current location is to target intervisibility；
3): target is located within the instantaneous detection visual field of infrared imaging device, that is, needs to meet following two formula simultaneously；
Wherein, θ, ε, φ, η are respectively the field of view center axis direction angle of infrared imaging device, field of view center axis height
Angle, horizontal direction investigative range angle and vertical direction investigative range angle, α are the angle of line of sight and direct north, and β is target
The angle of sight and horizontal plane, δ are instantaneous field of view's width, and horizontal field of view angle, ω is angular scanning speed, horizontal sweep mode, Δ t
For a certain specific moment in the single scan period,It is respectively the projection of φ and δ in the horizontal plane with δ '；
Further, the S2 includes:
S21: aimed contrast is calculated according to target relative distance, target temperature and environment temperature；
S22: according to target size feature and the simplified calculating target visual direction sectional area of application model is scouted；
S23: target subtended angle is calculated according to the instrument performance factor, target visual direction sectional area and target relative distance；
S24: liminal contrast is calculated according to target subtended angle and makees field operation amendment to it；
S25: identification probability p is calculated according to aimed contrast and targets threshold contrastd；
S26: according to the identification probability p being calculatedd, uniform random number R is extracted in (0,1) section, if R is less than pd,
Then think to identify target；Otherwise it is assumed that unidentified target；
Further, the S3 includes:
S31: itself comprehensive navigation and positioning accuracy and reconnaissance equipment measurement accuracy calculate target location accuracy, including target water
Flat positioning accuracy σTLWith target elevation location precision σTH
Wherein, σRFor the range accuracy of distance-measuring equipment, σξFor height angle measurement accuracy, σψFor Azimuth measurement precision, σHFor navigation
Elevation location precision, σAFor navigation orientation precision,For level of aggregation angle measurement accuracy, R is observer target distance, and ξ is
See the line of sight angle of site
S32: according to the σ being calculatedTLAnd σTH, the positioning accuracy for defining two orthogonal axis directions in horizontal plane is all the same, takes out
Take normal distribution random number simulation reconnaissance equipment to the position error of certain target (Δ x, Δ y, Δ z), target true coordinate it
Upper superposition position error, that is, analog obtains scouting positioning coordinate；
Further, the calculation method of step 2) the Instrumental performance factor Γ are as follows: detectd according to most of infrared imagings
The war skill index for examining equipment describes " in η ° × δ ° of standard field of view, d kilometers of visibility, T degrees Celsius of temperature, the equivalent temperature of target background
It is r kilometers to the identification distance of certain typical target under conditions of T degrees Celsius of poor Δ ", the visual direction sectional area of certain typical target
Area is s square metres, using following calculation method approximate solution Γ:
A. the attenuation coefficient under standard testing visibility is calculated；
B. the aimed contrast under standard test condition is calculated；
Cr=C0e-μr,
C. C is enabledt=Cr(thinking to identify that apart from corresponding identification probability be 0.5 under standard test condition), is calculated by following formula
χ out；
A, B, C, D, E are constant coefficient in formula；
D. Γ is acquired by following formula
The above instrument performance factor is obtained under the conditions of η ° × δ ° of standard field of view, if component performance is constant, depending on
Field width angle changes (η ' ° × δ ' °), then the instrument performance factor need to be corrected accordingly, i.e.,
Beneficial effects of the present invention are as follows:
The present invention entire will be scouted when infrared imaging device recon effect is simulated process be divided into search, detection identification and
Multiple stages such as confirmation positioning meet the physical logic process that equipment uses, the recon effect model in each stage and algorithm master
It can preferably embody equipment build-in attribute dependent on equipment war skill performance indicator and seem excessively complicated, calculate letter
It is single；And show that this method simulation error is smaller with the contrast verification of test data, there are the operations of a large amount of recon effect operations
It has a good application prospect in emulation especially major engagement emulation.
Detailed description of the invention
Fig. 1 is the basic flow chart of analogy method of the present invention；
Fig. 2 is the detection viewing field schematic diagram of infrared imaging reconnaissance equipment of the present invention；
Fig. 3 is curve graph of the identification probability described in the embodiment of the present invention with target temperature and distance change.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.On the contrary, the present invention cover it is any be defined by the claims do on the essence and scope of the present invention
Substitution, modification, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to this
It is detailed to describe some specific detail sections in the datail description of invention.It is thin without these for a person skilled in the art
The present invention can also be understood completely in the description of section part.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as a limitation of the invention.
Most preferred embodiment is enumerated below for of the invention:
As shown in Figure 1-Figure 3, the present invention provides a kind of infrared imaging device recon effect simulation suitable for emulation of fighting
Method, should confidence level with higher, and cannot have excessive complicated calculations and parameter input.
The present invention uses following technical scheme to solve above-mentioned technical problem:
Entire process of scouting is divided into multiple stages such as search, detection identification and confirmation positioning, and is based on different phase
Recon effect modeling is carried out, detailed process is as follows:
(1) search process is simulated
Search process is intended to judge whether the observation visual field of infrared imaging device effectively covers detected target, detailed process
Are as follows:
A. judge whether target is located within the scope of infrared imaging device maximum effect, if so, entering in next step, otherwise recognize
For target cannot be searched, exit；
B. judge infrared imaging device current location to target whether intervisibility, if intervisibility, into next step, otherwise it is assumed that not
Target can be searched, is exited；
C. judge that target whether within the instantaneous detection visual field of infrared imaging device, is recognized if meeting following two formulas simultaneously
To can search for target, target otherwise cannot be searched
Wherein, θ, ε, φ, η are respectively the field of view center axis direction angle of infrared imaging device, field of view center axis height
Angle, horizontal direction investigative range angle and vertical direction investigative range angle, α are the angle of line of sight and direct north, and β is target
The angle of sight and horizontal plane, δ are instantaneous field of view's width (horizontal field of view angle), and ω is angular scanning speed (horizontal sweep mode),
Δ t is a certain specific moment in the single scan period,It is respectively the projection of φ and δ in the horizontal plane with δ '；
(2) detection identification process simulation
After searching target, then detection identification link is entered.Detect identification process simulation, it is intended to set according to infrared imaging
Mathematical model constructed by the factors such as standby main war skill performance, battlefield surroundings condition and target signature information judges whether to send out completely
Existing target, specific calculation process are as follows:
A. aimed contrast C is soughtR
CR=C0e-μR,
In formula, R is target relative distance, the intrinsic contrast C of target0By environment absolute temperature TbWith target absolute temperature Tm
It determines, attenuation coefficient mu is related with weather condition；
B. target visual direction sectional area S is calculated
It fights and simplified way calculating target visual direction sectional area can be used in emulating, i.e.,
1. ground-to-ground scouting: S=1/2* (the wide * target of the long * target height+target of target is high)
2. air to surface scouting: S=1/3* (the wide long * target of * target height+target of the long * target height+target of target is wide)
3. ground-to-air scouting: S=1/3* (the wide long * target of * target height+target of the long * target height+target of target is wide)
C. target subtended angle χ is sought
Γ is the instrument performance factor in formula, determines that subtended angle χ is to be divided into unit by the war skill index of infrared imaging device；
D. liminal contrast C is soughtt
And field operation amendment is made to liminal contrast
C′t=kCt
A, B, C, D, E are constant coefficient in formula, and correction factor k is for characterizing camouflage of target effect or surface vegetation occlusion effect
To the influence degree of scouting；
E. identification probability p is soughtd
F. according to the identification probability p being calculatedd, uniform random number R is extracted in (0,1) section, if R is less than pd, then
Think to identify target；Otherwise it is assumed that unidentified target；
(3) target position fixing process is simulated
Target position fixing process simulation, it is intended to generate containing the targeting information for scouting error, process is as follows:
A. target location accuracy is calculated, remembers that the range accuracy of distance-measuring equipment is σR, Azimuth measurement precision is σψ, height angle measurement
Precision isNavigation horizontal positioning accuracy is σL, navigation elevation location precision is σH, navigation orientation precision is σA, observer target distance is
R, sight mesh difference in height are Δ h, then
See the line of sight angle of site:
Horizontal angle measurement accuracy:
Height angle measurement accuracy:
Target level positioning accuracy:
Target elevation location precision:
B. according to the σ being calculatedTL(thinking that the positioning accuracy of two orthogonal axis directions in horizontal plane is all the same) and σTH, i.e.,
Normal distribution random number simulation reconnaissance equipment can be extracted to position error (the Δ x, Δ y, Δ z) of certain target.It is really sat in target
The position error i.e. analog is superimposed on mark to obtain scouting positioning coordinate.
Calculating for detection identification process simulation Instrumental performance factor Γ, is mainly detectd according to most of infrared imagings
The war skill index for examining equipment describes " in η ° × δ ° of standard field of view, d kilometers of visibility, T degrees Celsius of temperature, the equivalent temperature of target background
It is r kilometers to the identification distance of certain typical target (visual direction sectional area area is s square metres) under conditions of T degrees Celsius of poor Δ ", it adopts
With following calculation method approximate solution:
A. the attenuation coefficient under standard testing visibility is calculated
B. the aimed contrast under standard test condition is calculated
Cr=C0e-μr,
C. C is enabledt=Cr(thinking to identify that apart from corresponding identification probability be 0.5 under standard test condition), is calculated by following formula
χ out
D. Γ is acquired by following formula
The above instrument performance factor is obtained under the conditions of η ° × δ ° of standard field of view, if component performance is constant, depending on
Field width angle changes (η ' ° × δ ' °), then the instrument performance factor need to be corrected accordingly, i.e.,
As shown in Figure 1, specific step is as follows when practical operation of the present invention:
(1) search process is simulated
Search process is intended to judge whether the observation visual field of infrared imaging device effectively covers detected target, detailed process
Are as follows:
A. judge whether target is located within the scope of infrared imaging device maximum effect, if so, entering in next step, otherwise recognize
For target cannot be searched, exit；
B. judge infrared imaging device current location to target whether intervisibility, if intervisibility, into next step, otherwise it is assumed that not
Target can be searched, is exited；
C. judge that target is to think to can search for target whether within the instantaneous detection visual field of infrared imaging device,
Otherwise target cannot be searched.
For convenient for analyzing instantaneous detection visual field, red watt of imaging device scouting only considers horizontal scanning single side mode.Total detection
Visual field can be by field of view center axis direction angle θ, field of view center axis angle of site ε, level detection angle φ and vertical sounding angle η come table
Show.As shown in Fig. 2, the total detection viewing field of reconnaissance equipment is OADHE, instantaneous detection visual field is OBCGF, and instantaneous detection visual field is total
Scanning single side is carried out in detection viewing field in a certain direction.
Enabling the angle of line of sight and direct north is α, and angle with horizontal plane β, equipment angular scanning speed is ω, scanning
Mode is to scan from the lesser side in detection viewing field azimuth to the biggish side in azimuth, and scan period T, δ are instantaneous view
Field width degree (horizontal field of view angle), Δ t are some specific moment in the scan period, then target is located at instantaneous detection visual field and wants simultaneously
It asks:
It notices
Wherein, angleIt is respectively the projection of search angle φ and instantaneous field of view width δ in the horizontal plane with δ ', t is current
Moment, t0To scan start time, T is the scan period, and k is completed scan period number.
The calculating of direction angle alpha and β for line of sight, then can be used such as under type:
Step1. geographic coordinate system (northern day east coordinate system) is constructed by origin of reconnaissance equipment position, is then set by scouting
Standby warp, latitude coordinate can determine geocentric coordinate system to the transition matrix T of geographic coordinate systemE。
Step2. enabling the three-component position of reconnaissance equipment and target in geocentric coordinate system is respectively (x0,y0,z0) and (xm,
ym,zm), then the line of sight in geographic coordinate system is
Step3. it enablesThen α and β are respectively
α=atan2 (rz,rx), β=asin (ry/r)
Wherein atan2 indicates the arctan function of four-quadrant.
For above-mentioned search process simulation is only for single target, multiple targets can be processed similarly.
(2) detection identification process simulation
After searching target, then detection identification link is entered.Detect identification process simulation, it is intended to set according to infrared imaging
Mathematical model constructed by the factors such as standby main war skill performance, battlefield surroundings condition and target signature information judges whether to send out completely
Existing target, specific calculation process are as follows:
A. aimed contrast C is soughtR
Aimed contrast is the relative ratio of target intrinsic brightness and background luminance, be detection discovery easy degree decision because
Element.The metric parameter of brightness is related with reconnaissance equipment type, should choose temperature as luminance parameter for infra-red reconnaissance equipment.
If the absolute temperature of target is Tm, environment absolute temperature is Tb, then the intrinsic contrast of target be
Aimed contrast is related with relative distance R, i.e.,
CR=C0e-μR
μ is attenuation coefficient in formula, mainly with the absorption of steam in transmission process, the decaying of haze and cloud, rain, snow, mist etc.
Decay related, the mean attenuation coefficient of infrared spectroscopy under corresponding weather can be chosen.Obviously, distance is remoter, and aimed contrast is smaller, more
Hardly possible identification.
B. target visual direction sectional area S is calculated
Line of sight sectional area is the target maximum surface area that reconnaissance equipment can observe, with sight mesh relative position and appearance
State is related, and simplified way can be used in emulation of fighting and calculate target visual direction sectional area, i.e.,
1. ground-to-ground scouting: S=1/2* (the wide * target of the long * target height+target of target is high)
2. air to surface scouting: S=1/3* (the wide long * target of * target height+target of the long * target height+target of target is wide)
3. ground-to-air scouting: S=1/3* (the wide long * target of * target height+target of the long * target height+target of target is wide)
C. target subtended angle χ is sought
Γ is the instrument performance factor in formula, determines that subtended angle χ is to be divided into unit by the war skill index of infrared imaging device；
D. liminal contrast C is soughtt
Liminal contrast, that is, probability of detection is aimed contrast corresponding to 50%, it depends on the subtended angle α of target, is led to
The analysis and research of a large amount of testing datas are crossed, find the logarithm and respective threshold contrast C of subtended angle αtLogarithm be located at a hyperbolic
On line, i.e.,
A=45.68751 in formula, B=94.23752, C=165.2692, D=254.8118, E=102.6117, lg are
Denary logarithm, therefore have
And field operation amendment is made to liminal contrast on this basis
C′t=kCt
Correction factor k is for characterizing camouflage of target effect or surface vegetation occlusion effect to the influence degree of scouting in formula；
E. identification probability p is soughtd
According to the definition of liminal contrast, in conjunction with test data, identification probability can be calculated as follows
F. according to the identification probability p being calculatedd, uniform random number R is extracted in (0,1) section, if R is less than pd, then
Think to identify target；Otherwise it is assumed that unidentified target；
(3) target position fixing process is simulated
Infrared Imaging Seeker often cooperates rangefinder to be used in conjunction with to position to the target of identification, but scouts
To coordinates of targets be not true target position, but containing scout position error.Target position fixing process simulation, it is intended to generate
Containing the targeting information for scouting error, process is as follows:
A. target location accuracy is calculated, size is mainly determined by itself navigation and positioning accuracy and reconnaissance equipment measurement accuracy
It is fixed.The range accuracy for remembering distance-measuring equipment is σR, Azimuth measurement precision is σψ, height angle measurement accuracy isHorizontal location of navigating essence
Degree is σL, navigation elevation location precision is σH, navigation orientation precision is σA, observer target distance R, sight mesh difference in height is Δ h, then
See the line of sight angle of site:
Horizontal angle measurement accuracy:
Height angle measurement accuracy:
Target level positioning accuracy:
Target elevation location precision:
B. according to the σ being calculatedTL(thinking that the positioning accuracy of two orthogonal axis directions in horizontal plane is all the same) and σTH, i.e.,
Normal distribution random number simulation reconnaissance equipment can be extracted to position error (the Δ x, Δ y, Δ z) of certain target.It is really sat in target
The position error i.e. analog is superimposed on mark to obtain scouting positioning coordinate.
In model above, instrument performance factor Γ is the key parameter for calculating identification probability and needing to use, it is reflected
The intrinsic scouting performance of Reconnaissance Equipment, but the scouting performance indicator of usually infrared imaging device is not to provide single Γ value,
But it uses " in η ° × δ ° of standard field of view, d kilometers of visibility, T degrees Celsius of temperature, T degrees Celsius of Δ of target background equivalent temperature difference
Under the conditions of to the identification of certain typical target (visual direction sectional area area is s square metres, can be calculated by target length) away from
From being r kilometers " describing mode, it is therefore desirable to use following calculation method approximate solution Γ
A. the attenuation coefficient under standard testing visibility is calculated
B. the aimed contrast under standard test condition is calculated
Cr=C0e-μr,
C. C is enabledt=Cr(thinking to identify that apart from corresponding identification probability be 0.5 under standard test condition), is calculated by following formula
χ out
D. Γ is acquired by following formula
The above instrument performance factor is obtained under the conditions of η ° × δ ° of standard field of view, if component performance is constant, depending on
Field width angle changes (η ' ° × δ ' °), then the instrument performance factor need to be corrected accordingly, i.e.,
By taking certain model Infrared Imaging Seeker as an example, scouting performance indicator be can be described as: in 30 ° × 30 ° of visual field, can see
6 kilometers of degree, 25 DEG C of temperature under conditions of 3 DEG C of target background equivalent temperature difference are 2 kilometers to 8m × 3m × 3m identification distance ", if
Visual field is constant, environment temperature and target size are constant, then the identification for (setting mean attenuation coefficient μ=0.26) under the fine environment of standard
Probability is as shown in Figure 3 with the changing rule of target temperature and distance.By comparison between calculation results and test data it is found that the present invention
The identification probability analogy method of proposition can preferably reflect that the capability of reconnaissance equipment, simulation error are no more than 15%.
Embodiment described above, only one kind of the present invention more preferably specific embodiment, those skilled in the art
The usual variations and alternatives that member carries out within the scope of technical solution of the present invention should be all included within the scope of the present invention.
Claims (6)
1. a kind of infrared imaging device recon effect analogy method suitable for emulation of fighting, which is characterized in that the method is logical
Target search procedure simulation is crossed, judges whether the observation visual field of infrared imaging device effectively covers detected target；Secondly to can
The detection identification process simulation for doubting target, judges target identification effect, finally simulates to target position fixing process, calculates to generate and contain
Scout the target position information of error.
2. analogy method according to claim 1, which is characterized in that the described method comprises the following steps:
S1: search process simulation judges whether the observation visual field of outer imaging device effectively covers detected target；
S2: detection identification process simulation, according to main war skill performance, battlefield surroundings condition and the target signature of infrared imaging device
Mathematical model constructed by the factors such as information judges whether the target for finding to be searched completely；
S3: the simulation of target position fixing process is generated containing the targeting information for scouting error.
3. analogy method according to claim 2, which is characterized in that effectively covering meets in the S1 search process simulation
The following conditions:
1): target is located within the scope of infrared imaging device maximum effect；
2): infrared imaging device current location is to target intervisibility；
3): target is located within the instantaneous detection visual field of infrared imaging device, that is, needs to meet following two formula simultaneously；
Wherein, θ, ε, φ, η are respectively the field of view center axis direction angle of infrared imaging device, the angle of site of field of view center axis, water
Square to investigative range angle and vertical direction investigative range angle, α is the angle of line of sight and direct north, and β is line of sight
With the angle of horizontal plane, δ is instantaneous field of view's width, and horizontal field of view angle, ω is angular scanning speed, and horizontal sweep mode, Δ t is single
The a certain specific moment in a scan period,It is respectively the projection of φ and δ in the horizontal plane with δ '.
4. analogy method according to claim 2, which is characterized in that the S2 includes:
S21: aimed contrast is calculated according to target relative distance, target temperature and environment temperature；
S22: according to target size feature and the simplified calculating target visual direction sectional area of application model is scouted；
S23: target subtended angle is calculated according to the instrument performance factor, target visual direction sectional area and target relative distance；
S24: liminal contrast is calculated according to target subtended angle and makees field operation amendment to it；
S25: identification probability p is calculated according to aimed contrast and targets threshold contrastd；
S26: according to the identification probability p being calculatedd, uniform random number R is extracted in (0,1) section, if R is less than pd, then recognize
To identify target；Otherwise it is assumed that unidentified target.
5. analogy method according to claim 2, which is characterized in that the S3 includes:
S31: itself comprehensive navigation and positioning accuracy and reconnaissance equipment measurement accuracy calculate target location accuracy, including target level is determined
Position precision σTLWith target elevation location precision σTH
Wherein, σRFor the range accuracy of distance-measuring equipment, σξFor height angle measurement accuracy, σψFor Azimuth measurement precision, σHFor the elevation that navigates
Positioning accuracy, σAFor navigation orientation precision,For level of aggregation angle measurement accuracy, R is observer target distance, and ξ is to see mesh
The sight angle of site
S32: according to the σ being calculatedTLAnd σTH, the positioning accuracy for defining two orthogonal axis directions in horizontal plane is all the same, extracts just
State distribution random numbers simulate position error of the reconnaissance equipment to certain target, and (Δ x, Δ y, Δ z) are folded on target true coordinate
The position error i.e. analog is added to obtain scouting positioning coordinate.
6. analogy method according to claim 4, which is characterized in that the calculating of step 2) the Instrumental performance factor Γ
Method are as follows: according to the war skill index of most of infrared imaging reconnaissance equipments description " η ° × δ ° of standard field of view, d kilometers of visibility,
T degrees Celsius of temperature under conditions of T degrees Celsius of Δ of target background equivalent temperature difference is r kilometers to the identification distance of certain typical target ",
The visual direction sectional area area of certain typical target is s square metres, using following calculation method approximate solution Γ:
A. the attenuation coefficient under standard testing visibility is calculated；
B. the aimed contrast under standard test condition is calculated；
C. C is enabledt=Cr(thinking to identify that apart from corresponding identification probability be 0.5 under standard test condition), calculates χ by following formula；
A, B, C, D, E are constant coefficient in formula；
D. Γ is acquired by following formula
The above instrument performance factor is obtained under the conditions of η ° × δ ° of standard field of view, if component performance is constant, visual field is wide
Degree angle changes (η ' ° × δ ' °), then the instrument performance factor need to be corrected accordingly, i.e.,
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